Microsoft showed off some upcoming Xbox Live Arcade titles, including a new …

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There were many surprises at Microsoft's press conference, but one of the things that got the largest audience reaction was the voice of Portal's GLadDOS addressing the crowd to let us know that something was coming. In fact, it appears that a Portal expansion is on the way to the Xbox Live Arcade.

The game is called Portal: Still Alive, and will hit the Xbox Live Arcade in 2008 with new levels, new achievements, and that's pretty much all we know. No game play was shown, and it's not known what else we can expect from the game—but it's coming.

Microsoft also showed off Geometry Wars 2, which gave a glimpse of four-player action and an even more frantic experience. Galaga: Legions is an update to the classic game, in the vein of Pac-Man Championship Edition. The demo of this classic game, updated for modern times, showed enemies coming from every direction, with some impressive graphics for an Arcade title.

No date was given for the release of Portal: Still Alive, but Geometry Wars 2 and Galaga: Legions will hit the service in August. We were also told a South Park title is on the way but, other than the slightest of teasers featuring Cartman cursing that he just wants to play video games, nothing else is known about that one.